Anything metal and solid will work. That bracket is fine.
The wire going to you hvac.. If that is where it's going is probably attached to your rear defroster circuit thus why it doesn't work.
I've hooked into the heated seat wire and rear defroster on my last prix at the hvac but while the remote start was engaged the buttons were disabled until a restart because the bcm sensed a short to ground. It took some relays and such but not worth it imo (labor time vs just pushing the button myself)
If you want rear defroster the remote start can be programmed to have a latched output for 10min and that can be used to trigger a relay that's output is connected to the defroster grid.
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